It seems like there's still quite some time for that.

I can't believe there is not a single Zelda that hit the 10 million milestone. It's even stranger to think that Sonic of all things has sold over 150 million units and Wii and Call of Duty are the third and fourth best-selling franchises ever...

I think it depends on how well their next handheld does. If that does great, then it can deffinitely happen next gen, but if it doesn't, I'm not so sure.

Here are the best selling Zelda games (all versions combined; looks much better :P)

1. Ocarina of Time (N64, 3DS): 11.19
2. Twilight Princess (Wii, NGC): 8.67
3. The Legend of Zelda (NES, GBA): 7.4
4. A Link to the Past (SNES, GBA): 7.31
5. Link's Awakening (GB, GBC): 6.05
6. The Wind Waker (NGC, Wii U): 5.89
7. The Adventure of Link (NES, GBA): 5.08
8. Phantom Hourglass (DS): 5.05
9. Skyward Sword (Wii): 3.88
10. Oracle of Ages/Seasons (GBC): 3.78
11. Majora's Mask (N64, 3DS): 3.36
12. Spirit Tracks (DS): 3.29
13. A Link Between Worlds (3DS): 2.41
14. The Minish Cap (GBA): 1.69
15. Four Swords Adventures (NGC): 0.81

Next generation!

I don't think that we need to count spinoffs, Hyrule Warriors is not Zelda game, but maybe we could count Links Crossbow Training..

Why count Link's Crossbow Training and not Hyrule Warriors? That doesn't make sense.

Hyrule Warriors is a spinoff, but it is still a apart of the franchise as a whole.

Very nice but the Ages and  Seasons games aren't the same.

Interesting to see though, OoT is still king!

Because Link's Crossbow is Nintendo game, like spinof shooter Zelda game, while Hyrule Warriors is Dinasty Warior game just in Zelda universe.

I think Link's Crossbow is more Zelda game then Hyrule Warriors.

I think we can assume Nintnedo is counting an higher number than that.
easily 85 mil plus all digital sales.

With Maora's mask adn ZeldaU we will easily get to 90mil.

next generation consoles will take us to 100 mil for sure!

Using this logic, we shouldn't count the Oracle games or The Minish Cap, because they're Capcom games. Or we don't count Super Mario Bros. 2 in the sales of the Mario series, since that's Doki Doki Panic, just with a Mario skin. =P

It sounds like you just wanna count Crossbow Training because it sold a lot. All spin-offs count. The series actually sold a little more than that, because there's those Tingle games released in Japan only.

No, beacuse Oracle and Minish Cap are Zelda games and Hyrule Warriors is Dynasty Warrior game.

I didn say I want 100% to count Crossbow Training, my point is that Crossbow Training is much more Zelda title than Hyrule Warriors.